function s1_hello(){
  echo "hello,world!"
}

function s2_tell_who_i_am(){
  echo "Enter you name:"
  read user_name
  echo "user name is $user_name"
}

function s3_which_distro_do_i_use(){
  NAME="Beta Linux"
  echo $NAME
}

function s4_view_my_cpu_arch(){
  uname -m
}

function s5_show_first_scsi_disk_size(){
  lsblk -l |grep disk | \grep'^sda' | awk'{print $4}'
}

function s6_show_main_memory_size_in_megabytes(){
  free -m |grep "Mem:"|awk'{print $2}'
}

